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21131331031 = 191119392737
BaseRepresentation
bin10011101011100001…
…101000010111010111
32000112200022211200001
4103223201220113113
5321234110043111
613412501432131
71345440231046
oct235341502727
960480284601
1021131331031
118a640a3848
124118a0b647
131cb9ba8395
14104665c55d
1583a2401c1
hex4eb8685d7

21131331031 has 8 divisors (see below), whose sum is σ = 21260001024. Its totient is φ = 21002849280.

The previous prime is 21131330963. The next prime is 21131331073. The reversal of 21131331031 is 13013313112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-21131331031 is a prime.

It is a super-2 number, since 2×211313310312 (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21131331131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 181495 + ... + 274231.

It is an arithmetic number, because the mean of its divisors is an integer number (2657500128).

Almost surely, 221131331031 is an apocalyptic number.

21131331031 is a deficient number, since it is larger than the sum of its proper divisors (128669993).

21131331031 is a wasteful number, since it uses less digits than its factorization.

21131331031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94121.

The product of its (nonzero) digits is 162, while the sum is 19.

Adding to 21131331031 its reverse (13013313112), we get a palindrome (34144644143).

The spelling of 21131331031 in words is "twenty-one billion, one hundred thirty-one million, three hundred thirty-one thousand, thirty-one".

Divisors: 1 191 1193 92737 227863 17712767 110635241 21131331031